Nagios 4 : Add Monitoring Target Item2026/03/27

	It's possible to add monitoring Target Items. There are many RPM packages for them. Or it's possible to create a plugin by yourself. And also there are many plugins provided by community below. ⇒ http://exchange.nagios.org/
[1]	Many plugins are provided with RPM packages like follows.

# use EPEL repo

[root@dlp ~]#

dnf --enablerepo=epel search nagios-plugins-

nagios-plugins-all.x86_64 : Nagios Plugins - All plugins
nagios-plugins-apt.x86_64 : Nagios Plugin - check_apt
nagios-plugins-bacula.x86_64 : Nagios Plugin - check_bacula
nagios-plugins-breeze.x86_64 : Nagios Plugin - check_breeze
nagios-plugins-by_ssh.x86_64 : Nagios Plugin - check_by_ssh
nagios-plugins-check-updates.x86_64 : A Nagios plugin to check if Red Hat or
                                    : Fedora system is up-to-date
nagios-plugins-cluster.x86_64 : Nagios Plugin - check_cluster
nagios-plugins-dhcp.x86_64 : Nagios Plugin - check_dhcp
nagios-plugins-dig.x86_64 : Nagios Plugin - check_dig
nagios-plugins-disk.x86_64 : Nagios Plugin - check_disk
nagios-plugins-disk_smb.x86_64 : Nagios Plugin - check_disk_smb
nagios-plugins-dns.x86_64 : Nagios Plugin - check_dns
.....
.....

[2]	For example, add [check_ntp] plugin to monitor time difference between the System time and NTP Server.

[root@dlp ~]#

dnf --enablerepo=epel -y install nagios-plugins-ntp

[root@dlp ~]#

vi /etc/nagios/objects/commands.cfg

# add follows to last line

define command {
    command_name    check_ntp_time
    command_line    $USER1$/check_ntp_time -H $ARG1$ -w $ARG2$ -c $ARG3$
}

[root@dlp ~]#

vi /etc/nagios/objects/localhost.cfg

# add to the last line
# Warning with 1 sec time difference, Critical with 2 sec difference

define service {
    use                     local-service
    host_name               localhost
    service_description     NTP_TIME
    check_command           check_ntp_time!ntp.nict.jp!1!2
    notifications_enabled   1
}

[root@dlp ~]#

systemctl reload nagios

[3]	It's possible to view the status for a new plugin on the admin site.

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